# Formula - Strain energy due to self weight in cylindrical bar

Q.  What is the strain energy caused due to self weight in a cylindrical bar?
- Published on 21 Sep 15

a. (W2 L) / (6 AE)
b. (W L) / (8 AE)
c.2/ 2G)V
d.2/ G)V

ANSWER: (W2 L) / (6 AE)

#### Discussion

• Sachin   -Posted on 26 Jun 17
I think options given are wrong. Right answer must be wsqureL/4AE.
Because deflection due to self weight in prismatic bar is WL/2AE.And strain energy is calculated by
S.E= 1/2(w*deflection).
• DIBYENDU MONDAL   -Posted on 19 Apr 17
Thank you.Good job to show this.Probably I can solve the critical problem now.
• Sravanthi   -Posted on 24 Nov 15
- The strain energy caused due to self weight in a cylindrical bar is given as (W2 L) / (6 AE)

- Here, W is the self weight, E is the Young's modulus, L is the length of bar, A is the area of cross-section.

- Strain energy is defined as the energy stored by a system which undergoes deformation under the application of load.

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